Review of Pleco powered by the Slant community.
Integrated dictionary / document reader / flashcard system with fullscreen handwriting input and live OCR
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Pros
Pro Offline use
The entire app is available offline so no internet connection is needs, which is good for when using a device that does not always have a data connection.
Pro Basic features are free
Vocabulary, sentences, and character breakdowns are all free.
Pro Cross-platform
Available for iOS and Android
Pro Ease of vocabulary lookup
Lookup by pinyin, character, handwriting, and image.
Pro Easy to look up examples of a particular character
Pro Apk file available from official website, which makes it easily accessible for Chinese users
Cons
Con In-app purchases
Useful features such as document reader, flashcards, and OCR character lookup can be quite costly ($10+ USD).